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1. If a magnet is moved into a coil of wire
a current is induced in the wire.
2. If the magnet is moved out of the coil
the direction of the current is reversed
3. A wire, or coil of wire, cutting through
a magnetic field will generate a
voltage. This induced voltage causes a
current to flow through the wire
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
The size of the induced voltage can be
increased if;
• the wire is moved faster
• the magnet is stronger
• the number of turns on the coil is
increased
• the area of the coil is greater
Increasing the voltageIncreasing the voltageIncreasing the voltageIncreasing the voltage
Increasing the voltageIncreasing the voltageIncreasing the voltageIncreasing the voltage
Increasing the voltageIncreasing the voltageIncreasing the voltageIncreasing the voltage
1. Electricity is generated by rotating a
coil of wire in a magnetic field or by
rotating a magnet inside a coil of wire.
This is how a generator works
Generators and DynamosGenerators and DynamosGenerators and DynamosGenerators and Dynamos
Generating ElectricityGenerating ElectricityGenerating ElectricityGenerating Electricity
GeneratorGeneratorGeneratorGenerator
DynamoDynamoDynamoDynamo
1. Transformers can be used to change
the voltage of an a.c. supply.
2. A changing magnetic field in the
primary coil induces a voltage in the
secondary coil
3. Transformers only work with
alternating voltage
TransformersTransformersTransformersTransformers
TransformersTransformersTransformersTransformers
1. Step-up transformers produce high
voltages so that little energy is lost in
power lines (National Grid)
2. Step-down transformers reduce
voltages before the electricity reaches
our homes
3. Primary voltage/Secondary voltage =
Number of turns on primary/Number of
turns on secondary
Step-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down Transformers
Step-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down Transformers
Step up TransformerStep up TransformerStep up TransformerStep up Transformer
Step down TransformerStep down TransformerStep down TransformerStep down Transformer
WordsearchWordsearchWordsearchWordsearch
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physics investigatory on Electromagnetic induction